KYB Suspension Strut P/N:551121
Help tame body motion and sharpen steering response on your truck with the KYB Gas-a-just Suspension Strut (MPN 5510049), a high-pressure monotube gas strut that drops in as a front-position replacement for the 2021-2025 Ford F-150 (see the Buyer's Guide tab for engine-level fitment).
Built as an OE monotube replacement, the Gas-a-just uses two separate working chambers: an air-free hydraulic piston and valve area for responsiveness and control, plus a high-pressure nitrogen chamber with a floating piston that supports a comfortable ride during normal driving and adds performance on demand. It's designed to help restore the original control and handling of the 2021-2025 Ford F-150.
Sold individually; replacing both front struts together is recommended for balanced handling.
Interchange: ML3Z18124P · ML3Z18124Q · ML3Z18124T
This part cross-references / interchanges with the following part numbers:
What vehicle does this KYB strut fit?
It is a front-position replacement for the 2021-2025 Ford F-150. Check the Buyer's Guide tab to confirm the exact engine and configuration for your truck.
What is a monotube gas strut?
A monotube design uses a single tube with the gas and oil separated by a floating piston, which helps deliver fade-free operation and instant response.
Why does the KYB Gas-a-just use high-pressure nitrogen?
The high-pressure nitrogen chamber with a floating piston supports a comfortable ride during normal driving and provides added performance on demand, while the higher pressure helps improve steering response.
Do I need to replace both front struts at once?
Each strut is sold individually. Replacing both front struts as a pair is recommended for balanced, even handling.
What are signs a strut may need replacing?
Common signs include excessive body motion, reduced handling and control, or fluid leaking, which can be a cause of strut failure. Diagnose the cause before replacing.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.